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Old 02-13-2013, 09:12 PM   #1
upthink
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Default STC-1000 not playing nicely with chest freezer

I'm currently in the process of switching my ancient (15 yr old) 15cf chest freezer from temperature controlled fermentation chamber to overflow keg storage. The freezer has been unplugged for sometime because I only need a heating element running off the STC-1000 for fermentation this time of the year. Now, that I'm not fermenting anything, I have a handful of kegs that are sitting on deck. My up-stairs keezer is only 5cf and maxes our with 2 corny kegs. To expand my capacity, I want to utilize the larger chest freezer (located in the basement) to offer additional drinking options in a simple, primitive way (using picnic taps).

So, here's the problem: if I plug the freezer directly into an outlet it turns on and runs correctly. If I plug it into the cold side of the STC-1000 it doesn't start up (only clicks once without the compressor kicking on).

Since it's an older unit, I have the STC-1000 set to a 2+ degree Celsius differential and a 6 minute compressor delay. I also confirmed that the STC-1000 is rated at 120v / 10 amps. The freezer listed at 5amps, so the STC-1000 should be capable of powering it. I have sat around patiently waiting for it to start up without success.

I was worried that this freezer might be too old for reliability, but the fact I can plug it into the wall outlet with successful operation several minutes after it fails to start with the STC-1000 has me curious.

I know there are a lot of topics about the STC-1000 unit on HBT. I apologize if this is a common problem and I missed the other threads. If not, has anyone else experienced a similar issue? Any suggestions or ideas?

Thanks in advance.

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Old 02-13-2013, 11:06 PM   #2
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Plug in a lamp or something else into the controller to confirm that it is or is not working properly and go from there. It the controller works properly powering a lamp but not the freezer you may have a bad connection somewhere that is not allowing enough amps to be drawn for the compressor to kick on.

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Old 02-13-2013, 11:19 PM   #3
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I have confirmed that the outlet on the cold side is working with a fan and light plugged in.

I'll get my hands on a multi-meter and see if I can run some additional tests.

Honestly, this freezer is so old that it could very well be the compressor failing. While I have had luck unplugging / replugging to by-pass the temp controller, it could have been pure luck that it decided to kick on.

I"ll continue to test.

Thanks!

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Old 02-13-2013, 11:23 PM   #4
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As mentioned, check to make sure the wiring is ok by using a simple lamp or other small appliance. If you can hear the click of the relay after the 6 min delay, but aren't getting power to your test lamp, I'd check your wiring.

You are waiting for the 6 min delay after powering it on right?

Edit: Nevermind, my typing is too slow.

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Old 02-23-2013, 05:24 PM   #5
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JuanMoore raises a good point. Plug it back into the STC1000 and walk away for 10 minutes. The device doesn't start up the heating or cooling until at least the first delay cycle. Come back in 10 minutes and it may be working.

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Old 02-23-2013, 05:42 PM   #6
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Quote:
Originally Posted by pfgonzo View Post
JuanMoore raises a good point. Plug it back into the STC1000 and walk away for 10 minutes. The device doesn't start up the heating or cooling until at least the first delay cycle. Come back in 10 minutes and it may be working.
I kept everything connected for 24 hours without any luck with the compressor. Confirmed that the compressor still had issues independent of the STC-1000.

Unplugged and gave up. Returned a couple days later and tried again. Success. It's been operating flawlessly.

The freezer is 15 years old, so it's clearly a bit unreliable after my testing.

I'll hope for the best.

Thanks for the advice.
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